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Finding the Fourth Proportional to 1,113.90, 1,670.81 and 344.40

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Solution

The fourth proportional to 1,113.90, 1,670.81 and 344.40 is: 516.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,113.90 : 1,670.81 = 344.40 : x
  2. Step 2: Convert to fraction form
    1,113.90/1,670.81 = 344.40/x
  3. Step 3: Cross multiply
    1,113.90x = 1,670.81 × 344.40
  4. Step 4: Simplify right side
    1,113.90x = 575,426.96
  5. Step 5: Solve for x
    x = 575,426.96/1,113.90
  6. Step 6: Final answer
    x = 516.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.